$ git clone -n https://src.fedoraproject.org/rpms/nagios.git /var/lib/mock/f42-build-3533036-46329/root/chroot_tmpdir/scmroot/nagios
Cloning into '/var/lib/mock/f42-build-3533036-46329/root/chroot_tmpdir/scmroot/nagios'...
$ git fetch origin ffcb5f8a4f480d060db53621a6f0fbb899de8c0a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/nagios
 * [new ref]         ffcb5f8a4f480d060db53621a6f0fbb899de8c0a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ffcb5f8 Add sysusers.d config file to allow rpm to create users/groups automatically